Tool-grinder



W. J. F. BOETTCHER. TOOL GRINDER.

APPLICATION FILED MAR. 18, l9l9.

1,386,088, Patented Aug. 2, 1921.

zz/zzzzm/Jxzo ezzczer IN VEN TOR.

' ATTORNEYS.

UNITED STATES PATENT OFFICE.

TOOL-GRINDER.

Specification of Letters Patent.

' Patented A110". 2, 1921.

Application filed March 18, 1919. Serial No. 283,338.

To all whom it may concern:

Be it known that I, WILLIAIJ J. F. Bonrrcrrnn, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Tool-Grinders, of which the following is a specification.

This invention relates to tool grinders ot the hand-operated type, and its object is to provide a grinder of this kind whose gear case is constructed of a design to eliminate the torcing-out of the lubricating oil through its wall joints from the action of the gears, and to facilitate filling with the lubricant and easy access to the gears.

lVith this object in view, the invention consists in a novel combination and arrangement of parts to be presently described and claimed, and in order that the invention may be better understood, reference is had to the accompanying drawing, in which- Figure 1 is a front elevation of the grinder;

Fig. 2 is a side elevation thereof, looking from the right of Fig. 1;

Fig. 3 is a vertical cross-section of the gear case; and

Fig. 4; is a perspective view of the cover plate for the gear case.

Referring specifically to the drawing, 5 denotes the gear case of the grinder. the same having the form of a narrow trough with its bottom rounded, as shown at 6. The side walls of the gear case are reinforced by external ribs 7 to form bearings 8 for the spindle 9, which carries the large gear 10 and the crank handle 11. Above the bearings 8 are bearings for the spindle 13 of the small gear 14, said spindle extending to take the grinding wheel 15; and that wall of the gear case facing the grinding wheel 15 is formed with a boss 16 for the attachment of an adjustable tool holder 17. The bottom of the gear case is extended laterally at 18 and downwardly at 19, to form a table clamp operated by a hand screw 20.

The above parts, with the exception of the peculiar construction of the gear case, a de scription of which follows, embody standard hand-grinder construction, and no novelty is claimed in respect thereto. It is therefore thought that a more detailed showing or description of such parts is unnecessary.

Now referring to the gear case, it should be noted that the same is cast in one piece, and with an opening of full width and breadth at the top, to permit easy insertion of the gears and filling of the case with lubrieating oil. The top of the gear case is shaped to receive a cover plate 21 ot gable form. This plate is dimensioned to meet the walls of the gear case flush, and has a reduced marginal flange 22 depending from its bottom surface, which fits into the top of the case, so as to make a hermetical closure therewith. From the middle of the cover plate 21 depends a horizontally apertured lug 23, and the side walls of the gear case are apertured at 24 to register with the aperture in the lug 23. A cotter pin 25, passed through the apertures 2a and the lug 23, serves to secure the cover plate in place, and makes removal of the same an easy matter.

The particular design of the gear case and the cover plate described above is such as to eliminate the escape of lubricating oil, or the squirting thereof upon the operators clothes or other objects in the vicinity of the grinder. The large gear usually picks up oil from the bottom of the gear case and, by centrifugal force, throws the oil through scams or joints, of the case, if such are located at or below the center of the gear. In the present instance the only joint is located above the large gear, and is of such design as to make an effective seal, preventing discharge of oil therethrough.

I claim:

A gear case i or hand-operated. tool grinders comprising a trough made in one piece and having its top open at a point above the gears, and a gable shaped cover plate for said top, said plate having a depending lug adapted to receive a cross pin passed through the side walls of the trough.

In testimony whereof I afiix my signature.

Ji/IILLIAM J. F. BOETTCHER. 

